Update: I had it happen to another pony. I took the helmet off and the mane was gone. I logged off and back on and the mane was back, so I equipped the helmet and took it off again and again the mane was gone. It seems to be something to do with helmets.

This issue is complex and may not be fixable with certain manes that arc into the base of the neck area. It is not a high priority fix currently, since it only occurs on 1-2 manes and may require a rebuilding the model for that particular mane. If the issue is fixed, it will be noted specifically in our Changelog for a build and this issue will be noted and closed at that time.

The 91% of memory in use is the issue. LoE requires a chunk of memory to be open and free to use during play. If you have too many other memory intensive programs running and not enough space for LoE, then it can cause a crash when the game tries to pull extra memory to run.

Mar 21 2019

Something to add on, I've recreated the earth pony shortly after with the animal talent and the result was the same. It took me a few attempts to get to a point where the ponies at graduation would separate throughout Equestria. What I seem to notice was that if you don't use Guidance while doing the animal talent quest, the result is the same as described here. If you do, everything works out.

after popup, can switch to different room manually and connection is all good again until error once more. Connection to game is not even lost, as global chat messages/interaction still happens, just annoying popup that will not go away